The natural wind changes frequently in forest environment because of topography, terrain, ground surface vegetation and so on.

自然风在森林环境中因受地形、地势和地表植物等因素的共同影响而变化丰富。

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In this paper, influence of wind-sand flow on soil wind erosion was discussed using portable wind tunnel to simulate natural wind.

通过在便携式风洞内模拟挟沙气流，研究了风沙流对土壤风蚀的影响。

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The two pictures show us that the flower, which is raised in a greenhouse and carefully protected, cannot stand natural wind and rain at all.

这两幅画告诉我们，在温室中养育和精心保护的花朵，根本经不起自然风雨。

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The action of wind and water can form cave openings like natural rooms within the rock.

VOA: special.2009.07.20

Just on the other side of the lock are natural waterways that wind through freshwater marsh.

VOA: standard.2010.05.09

While a single wind-turbine does not affect the global atmosphere, the installation of a large number of such devices will interfere with the atmospheric circulation and diminish the extraction efficiency on the large scale, since any extraction of momentum will act in competition with natural wind-power energy dissipation by turbulence in the boundary layer.

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Boone Pickens, once an ardent supporter of wind power, has announced plans to scale back wind investment, primarily because natural gas has made wind unattractive to investors.

FORBES: The Fiscal Cliff and Smart Energy Tax Policies

The EIA estimates onshore wind power will be 80% more expensive than conventional natural gas power, offshore wind power will be 142% more expensive than natural gas, solar thermal power will be 208% more expensive than natural gas, and solar photovoltaic will be 377% more expensive than natural gas.

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